Added feature to disable special NAT support

CHANGELOG.md

@@ -4,6 +4,7 @@ This project follows [semantic versioning](http://semver.org).
 
 ### Unreleased
 
+- [added] Added feature to disable special NAT support
 - [changed] Improved port forwarding on quirky routers
 - [changed] Reduced peer timeout to 5min to work better with NAT
 

Cargo.toml

@@ -24,7 +24,7 @@ rand = "0.7"
 fnv = "1"
 net2 = "0.2"
 yaml-rust = "0.4"
-igd = "0.9"
+igd = { version = "0.9", optional = true }
 siphasher = "0.3"
 daemonize = "0.4"
 ring = "0.16"
@@ -38,8 +38,9 @@ pkg-config = "0.3"
 tempfile = "3"
 
 [features]
-default = []
+default = ["nat"]
 bench = []
+nat = ["igd"]
 
 [profile.release]
 lto = true

src/port_forwarding.rs

@@ -2,20 +2,23 @@
 // Copyright (C) 2015-2019  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
+#[cfg(feature = "nat")]
+mod internal {
+
     use std::{io, net::SocketAddrV4};
 
     use igd::{search_gateway, AddAnyPortError, AddPortError, Gateway, PortMappingProtocol, SearchError};
 
-use super::util::{get_internal_ip, SystemTimeSource, Time, TimeSource};
+    use crate::util::{get_internal_ip, SystemTimeSource, Time, TimeSource};
 
     const LEASE_TIME: u32 = 1800;
-const DESCRIPTION: &str = "VpnCloud";
 
+    const DESCRIPTION: &str = "VpnCloud";
 
     pub struct PortForwarding {
         pub internal_addr: SocketAddrV4,
         pub external_addr: SocketAddrV4,
-    pub gateway: Gateway,
+        gateway: Gateway,
         pub next_extension: Option<Time>
     }
 
@@ -151,3 +154,22 @@ impl Drop for PortForwarding {
             self.deactivate()
         }
     }
+}
+
+#[cfg(not(feature = "nat"))]
+mod internal {
+    pub struct PortForwarding;
+
+    impl PortForwarding {
+        pub fn new(_port: u16) -> Option<Self> {
+            warn!("Compiled without feature 'nat', skipping port forwarding.");
+            None
+        }
+
+        pub fn check_extend(&mut self) {
+            unreachable!()
+        }
+    }
+}
+
+pub use internal::*;